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Among those words that symbolized the Church during its first millennium, ‘Fraternity' is one of the most significant. Indeed, this word expressed the vital relationship between those baptised into the ‘Brotherhood of Christ'. Yet, curiously, no in-depth historical and theological study had treated this subject until now. This book, written by a theologian who is also a pastor, is the fruit of long and patient research. Presented in three volumes, it lays emphasis on a fundamental and too easily forgotten aspect of what the Church represents. This first part focuses on the first three centuries, during which the Church referred to itself as a ‘Brotherhood'. Volume two explains the theological foundation of this title, which was accentuated during the 4th and 5th centuries, when the Church was the ‘Brotherhood of Christ'. The third volume shows how from the 8th century onwards - despite a lull during the 6th and 7th centuries - monks restored the concept of the Church as a ‘Holy Brotherhood', living in the Trinity and open to the entire world.